Evaluation of Several Turbulence Models for Turbulent Flow in Concentric and Eccentric Annuli

Azouz, Idir; Shirazi, Siamack A.

doi:10.1115/1.2795047

Cited by 19 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, in Nouri [17], the inner profile appeared to be in disagreement with the viscous law in the viscous sub-region, hinting to a different normalization of the velocity profiles (in the present work all profiles have been normalized by considering the local value of the friction velocity). For an additional discussion on issues of normalization in the work of Nouri [17] refer to Chung [18] and Azouz [25]. The streamwise rms seems in good agreement with the experiment.…”

Section: Case Asupporting

confidence: 75%

Anisotropic Turbulence and Coherent Structures in Eccentric Annular Channels

Merzari

Ninokata

2008

Flow Turbulence Combust

View full text Add to dashboard Cite

Eccentric annular pipe flows represent an ideal model for investigating inhomogeneous turbulent shear flows, where conditions of turbulence production and transport vary significantly within the cross-section. Moreover recent works have proven that in geometries characterized by the presence of a narrow gap, large-scale coherent structures are present. The eccentric annular channel represents, in the opinion of the present authors, the prototype of these geometries. The aim of the present work is to verify the capability of a numerical methodology to fully reproduce the main features of the flow field in this geometry, to verify and characterize the presence of large-scale coherent structures, to examine their behavior at different Reynolds numbers and eccentricities and to analyze the anisotropy associated to these structures. The numerical approach is based upon LES, boundary fitted coordinates and a fractional step algorithm. A dynamic Sub Grid Scale (SGS) model suited for this numerical environment has been implemented and tested. An additional interest of this work is therefore in the approach employed itself, considering it as a step into the development of an effective LES methodology for flows in complex channel geometries. Agreement with previous experimental and DNS results has been found good overall for the streamwise velocity, shear stress and the rms of the velocity components. The instantaneous flow field presented large-scale coherent structures in the streamwise direction at low Reynolds numbers, while these are absent or less dominant at higher Reynolds and low eccentricity. After Reynolds averaging is performed over a long integration time the existence of secondary flows in the cross session is proven. Their shape is found to be constant over the Reynolds range surveyed, and dependent on the geometric parameters. The effect of secondary flows on anisotropy is studied over an extensive Reynolds range through invariant analysis. Additional insight on the mechanics of turbulence in this geometry is obtained.

show abstract

Section: Case Asupporting

confidence: 75%

Anisotropic Turbulence and Coherent Structures in Eccentric Annular Channels

Merzari

Ninokata

2008

Flow Turbulence Combust

View full text Add to dashboard Cite

show abstract

“…Zarate et al [13] carried out the RANS of isothermal and heated turbulent upward ow in a vertical concentric annular channel with its inner wall heated. Azouz and Shirazi [14] evaluated several RANS models to predict the turbulent ow in concentric annuli and compared their results with the experimental data given by Nouri et al [5]. Recently, Chung et al [15] performed a direct numerical simulation on annular channel ows at low Reynolds number.…”

Section: Introductionmentioning

confidence: 94%

Large eddy simulation of turbulent concentric annular channel flows

Liu

2004

Numerical Methods in Fluids

View full text Add to dashboard Cite

SUMMARYFully developed turbulent concentric annular channel ow has been investigated numerically by use of large eddy simulation (LES) technique coupled with a localized one-equation dynamic subgrid-scale (SGS) model. The objective of this study is to deal with the behaviour of turbulent ow near the inner and outer walls of the concentric annular channel and to examine the e ectiveness of LES technique for predicting the turbulent ow in uenced by the transverse curvature e ect. The computations are performed for the Reynolds number Re = 180, 395 and 640, based on an averaged friction velocity and the annular channel width with the inner and outer cylinder radius being R i = 1 and Ro = 2. To validate the present approach, calculated results for turbulent pipe ow and concentric annular channel ow are compared with available experimental data and direct numerical simulation results, which conÿrms that the present approach can be used to study turbulent concentric annular channel ow satisfactorily. To elucidate turbulence characteristics in the concentric annular channel, some typical quantities, including the resolved velocity, turbulence intensity, turbulent eddy viscosity, SGS kinetic energy, SGS dissipation rate, Reynolds stress budgets, and turbulence structures based on the velocity uctuations, are analysed.

show abstract

“…Hanjalic (1974) studied turbulence features in annular ducts based on the Reynolds‐averaged Navier–Stokes (RANS) equations with a differential transport model. Azouz and Shirazi (1998) used RANS approach to predict the turbulent flow in annular channels. Kang et al (2001) carried out numerical simulation with RANS method on the isothermal and heated turbulent upflow in a vertical concentric annular channel, with its inner wall heated.…”

Section: Introductionmentioning

confidence: 99%

CFD applied to turbulent flows in concentric and eccentric annuli with inner shaft rotation

et al. 2011

View full text Add to dashboard Cite

Turbulent flows in concentric and eccentric annuli with and without rotating inner cylinder were investigated by numerical simulations. Similar flows occur in drilling operations of oil wells. Several turbulence models with Reynolds Average Navier-Stokes approach were used in the simulations and the respective models predictions were compared with experimental data from the literature. The simulated results of axial and tangential velocities show a good agreement with the experimental data. As compared with another turbulence models, the simulations with the standard Reynolds Stress model presented a slightly better prediction for most of the responses studied.On a analysé des turbulences en espaces annulaires concentriques et excentriques avec ou sans cylindre interne tournantà l'aide de simulations numériques. Desécoulements semblables se produisent lors d'activités de forage de puits de pétrole. Plusieurs modèles de turbulence avec l'approche de Navier-Stokes en moyenne de Reynolds ontété utilisés dans les simulations et les prédictions respectives des modèles ontété comparées aux données expérimentales de la littérature. Les résultats simulés des vélocités axiales et tangentielles cadrent bien avec les données expérimentales. Comparativementà d'autres modèles de turbulence, les simulations avec le modèle de tension de Reynolds standard ont présenté une prédiction légèrement supérieure pour la plupart des réponsesétudiées.

show abstract

Evaluation of Several Turbulence Models for Turbulent Flow in Concentric and Eccentric Annuli

Cited by 19 publications

References 17 publications

Anisotropic Turbulence and Coherent Structures in Eccentric Annular Channels

Anisotropic Turbulence and Coherent Structures in Eccentric Annular Channels

Large eddy simulation of turbulent concentric annular channel flows

CFD applied to turbulent flows in concentric and eccentric annuli with inner shaft rotation

Contact Info

Product

Resources

About